Internet Explorer 6.0 cocoon reader PDF defect?

[depub2]

I am unable to get MS IE 6.0 to display a PDF file that
comes from a reader. It works fine when using the fo2pdf
serializer, but I need to use the reader to read a file.

The following sitemap excerpt behaves nicely with Mozilla
and MS IE 5.5; BUT NOT MS IE 6.0.

<map:match pattern="PDFdebug/*.pdf">
  <map:read mime-type="application/pdf"  src="{1}.pdf"/>
</map:match>

Using cocoon 2.1.4 release.

Help!! What's the problem??

David